import os

# os.system("ls")

# ret = os.popen("ls")
# print(ret.read())
# l = ["a", "b", "c"]
# print("\\".join(l))
# print(os.path.join("a","b","c"))
# print(os.path.sep)
# path = "D:\\PycharmProjects\\PythonProject\\模块二\\Day09\\07.py "
# print(os.path.basename(path))
# print(os.path.dirname(path))